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Uguru Island

Uguru Island, located in the southernmost region of Shikoku, Japan, is a remarkable dive site situated approximately 23 kilometers off the coast of Shukumo city. Thanks to the influence of the Kuroshio Current, this area boasts exceptional underwater visibility, ranking among the highest in the country, reaching up to an impressive 50 meters on optimal days. Divers can relish in the diverse topography and thriving coral ecosystems, offering a delightful year-round display of tropical fish. The site caters to both novice and proficient divers, offering captivating opportunities to explore both large fish hotspots and indulge in macro observations.

This captivating dive spot is frequently visited by an array of impressive migratory marine species, including bluefin tuna, large yellowtail, yellowtail, and bigeye trevally. In addition, fortunate divers may encounter majestic creatures such as manta rays and hammerhead sharks, and even stand a good chance of observing sea turtles. For enthusiasts of macro diving, there is a designated area where one can admire the enchanting black-and-white lily goby, kudagombe, blue-and-white snapper, and red-and-white crab.

For those seeking an extraordinary diving experience in Japan, Uguru Island is an ideal choice. With its remarkable visibility of 13 meters, maximum depth of 20 meters, and advanced diver level recommendation, this captivating site promises unforgettable underwater explorations. The island's close proximity to attractions like the 剣神社跡 (Kengensha Site) in Okinoshimacho-Ugurushima, Sukumo, Kochi Prefecture, further enhances the appeal of this pristine dive location.

Diving Conditions Score for Uguru Island

7.5
Good

Good diving conditions!
The score is based on a calculation of the current weather and sea conditions.

Dive Site Overview for Uguru Island

Depth

20m

Visibility

13m

Experience Level

advanced

Weather Conditions for Uguru Island

Wave Height

0.7m

Wind Speed

9.2 m/s

Water Temp

24.1°C

Visibility

19.84km

Cloud Cover

42%

Wave Period

7.6s

Air Temperature

20.7°C

Precipitation

0 mm

Detailed 7-Day Diving Forecast for Uguru Island
Alpha

Dive Score Chart for Uguru Island

Best time to dive: 13:00 with score 7.487372486772487/10. Water conditions: Waves 0.8m, Wind 7.3 m/s.Best night dive time: 3:00 with score 6.311566666666667/10.

Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.

Sunrise at Uguru Island: 06:00
Sunset at Uguru Island: 18:00

Optimal diving conditions at Uguru Island are affected by daylight hours. Sunrise occurs at 06:00 and sunset at 18:00, which impacts visibility and water temperature for scuba diving and snorkeling.

🌞
Best Overall
13:00

Score: 7.5/10
Waves: 0.8m (6.3s), Wind: 7.3 m/s

🌙
Best Night
3:00

Score: 6.3/10
Waves: 1.1m, Wind: 36.9 m/s

Seasonal Analysis for Uguru Island
Alpha

Historical patterns and best seasons for diving at Uguru Island

The dive score combines all factors to rate overall diving conditions throughout the year. Higher scores indicate better diving conditions.

Monthly Dive Score Analysis - Seasonal Diving Conditions

Higher values indicate better diving conditions

Seasonal DiveScore Chart

This chart displays monthly diveScore data throughout the year, showing seasonal patterns. The data is presented as a bar chart with an overlaid line graph.Dive scores range from 1 to 10, with 10 being optimal conditions.

Higher values indicate better diving conditions

Best Season for Uguru Island

Winter

Avg. Score: 10.0/10

Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.

Best Months for Uguru Island

January
Score: 10.0
February
Score: 10.0
March
Score: 10.0

Ideal Conditions for Uguru Island

Water Temp

Thermometer Emoji

23.3°C / 73.9°F

June

Visibility

Telescope Emoji

20.1m / 65.9ft

October

Wave Height

Wave Emoji

0.2m / 0.7ft

January

Wave Period

Wave Emoji

8.0s

January

Seasonal Insights for Uguru Island

Uguru Island shows typical northern hemisphere patterns with June being the warmest month (23.3°C) and December the coldest (19.3°C). The calmest conditions typically occur in January with average wave heights of 0.2m and wave periods of 8.0s. The most comfortable wave conditions are in January with a low wave steepness ratio, creating gentler swells. January offers the longest wave periods (8.0s), creating more comfortable and predictable conditions for boat entries and exits. Ocean currents are slowest in January (0.5m/s) and strongest in January (0.5m/s). January is usually the driest month with 0.0mm of precipitation. For beginners, the best time to visit would be during January to March, when ocean conditions are calmer with long-period waves and currents are typically weaker. Experienced divers might enjoy the challenges and potentially better visibility during the shoulder seasons, with moderate currents that can improve marine life encounters.

Scoring Legend:
9-10 (Excellent)
7-8 (Good)
5-6 (Average)
3-4 (Poor)
1-2 (Dangerous)

Last updated: 1 min. ago - Jun 22, 2026

Note: This dive site is not a verified dive site. Please dive with caution. This dive site might have incorrect information by the community.

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